可可包装器，用于交互式Unix命令 [英] Cocoa wrapper for an interactive Unix command

问题描述

好吧，所以我知道您可以创建一个NSTask来使用Objective-C运行命令行工具:

Ok, so I know you can make an NSTask to run command line tools with Objective-C:

NSTask *task;
task = [[NSTask alloc] init];
[task setLaunchPath: @"/usr/bin/gdb"];
[task launch];

我只是想知道是否有一种方法可以与诸如gdb之类的交互式命令行工具进行通信.这将涉及基于用户交互(例如run，kill或quit与gdb)提供命令输入，然后根据其输出的信息做出反应.

I'm just wondering if there's a way to communicate with interactive command line tools such a as gdb. This would involve giving the command inputs based on user interaction (like run, kill or quit with gdb) and then reacting based on the information it outputs.

推荐答案

您可以将NSTask的setStandardInput:，setStandardOutput:和setStandardError:选择器与NSPipe实例结合使用，以与启动的程序进行通信.

You can use NSTask's setStandardInput:, setStandardOutput: and setStandardError: selectors in conjunction with NSPipe instances to communicate with the launched program.

例如，要读取任务的输出:

For example, to read the task's output:

task = [[NSTask alloc] init];
[task setStandardOutput: [NSPipe pipe]];
[task setStandardError: [task standardOutput]]; // Get standard error output too
[task setLaunchPath: @"/usr/bin/gdb"];
[task launch];

然后，您可以获得一个NSFileHandle实例，该实例可用于读取以下任务的输出:

You can then obtain an NSFileHandle instance that you can use to read the task's output with:

NSFileHandle *readFromMe = [[task standardOutput] fileHandleForReading]; 

要设置用于向gdb发送命令的管道，您需要添加

To set up a pipe for sending commands to gdb, you would add

[task setStandardInput: [NSPipe pipe]];

之前，您启动任务.然后用

before you launch the task. Then you get the NSFileHandle with

NSFileHandle *writeToMe = [[task standardInput] fileHandleForWriting];

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